The is no set seating plan for the Airbus A340-300 series. Airlines are all different about how they want to have a seating layout. One airline may want it to be a all economy and buisness, e.g: Air France, while the other airline would like it to be economy, buisness and first class, e.g: Cathy Pacific.
The standard seating plan of the Airbus A319 is for 24 rows of six seats, three seats either side of a central aisle.
The standard economy configuration of the Airbus A340 is 2-4-2.
2-4-2
The Airbus A321 has 3 seats either side of it's single aisle in a typical economy seating plan. (3+3). with 33/34 rows depending on carrier. Business class, where fitted is typically 2+2. Check Seat Guru (related links) for seating plan for specific airlines/routes.
Airbus do not make an aircraft designated M83. Most of their 2-aisle wide-bodied jets use a 2-4-2 economy seating plan. The smaller 1-aisle aircraft (A320) use a 3-3 economy plan.
There is no such thing as an Airbus B767
http://www.thy.com/en-INT/corporate/about_us/fleet/a330_200.aspx
For economy 2-4-2. Business class is often 2-2-2 or 1-2-1
The economy seats are configured as 2-4-2 on both variants of A340 operated by Virgin Atlantic. www.seatguru.com has full seating plan.
this aircraft has a 3-3 seating on either side
For an Airbus A318: corporate seating is typically 18, can fit 132.
According to the Delta website, last updated Oct. 10, 2011, the most advanced Airbus that Delta operates is the 298 passenger A330-300. A link to the seating chart is available below.